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How did the pig on pg. 342 become ‘glowing’? How does this relate to the transformation lab?
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Application of Human Genetics Genetic Engineering – altering the genetic material of an organism Transferring genes from one organism to another
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Why is this good? Drug companies genetically engineer organisms to produce proteins that could correct/ replace the need for the malfunctioning gene. EX: Bacteria with human insulin gene to help produce insulin for diabetics Supply the protein…fix the disease
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Why good? Vaccines made through genetic engineering may limit the dangers of the virus from which they are made.
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Genetic Engineering results in recombinant DNA – DNA that has been engineered. Recombinant, transgenic, genetically modified – all mean organisms with recombinant DNA
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Problems? How do genes interact? How does the product of one gene ( a protein) affect another gene (epistasis)? Are there genes for Asthma? Obesity? Schizophrenia? Cancer? Aging? Probably not a single gene, but the interaction of genes and environmental factors
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GENETICALLY MODIFIED ORGANISM (GMO) Food Crops – corn and soybean that are round-up ready A Bacteria gene that is an insecticide was inserted into the corn genome
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GMO uses cont. Live Stock – grow faster, more muscle, less fat Produce milk with certain proteins Medical treatment – recombinant bacteria can make the missing protein Research – organisms that glow…the glow gene is used as a marker Control gene expression
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HOW? http://www.adelaide.edu.au/agcareers/Content/Teach erResources/PestControl/Genetic.htm http://www.adelaide.edu.au/agcareers/Content/Teach erResources/PestControl/Genetic.htm
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Some Definitions Plasmids are circular DNA in bacteria. Restriction enzymes can “cut” the gene out so that it can be inserted into the plasmid.
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Microarray – pg. 342 fig 2. Show which genes are actually transcribed (active) This can show epigenetics
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Epigenetics is the study of inherited changes in phenotype (appearance) or gene expression caused by mechanisms other than changes in the underlying DNA sequence
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DNA fingerprint – segments of DNA that are unique in individuals Gene Counceling – informs people about genetic risks that could affect offspring Gene Therapy – Inserting a good gene to replace the defective gene
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CLONING – Genetically identical Natural Cloning – binary fission in bacterial and unicellular organisms, budding SOMATIC CELL NUCLEAR TRANSER (SCNT) – Egg nucleus (haploid) is replaced with an adult cell (diploid) and it starts to develop into an embryo Problems: survival short Large fetuses Failure to develop normally with age Benefit – Stem cells from SCNT do not have a true parent. They can be separated in early development so the embryo does not develop further.
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ETHICAL ISSUES Safety (genes escaping, unforeseen affects) Human Rights – who should have the info? What to do with the info? Property Laws - patents
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BIOETHICAL TOPICS: GMO GENE PATENTS GENE THERAPY CLONING (human cloning is not a topic)
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Debate Format Groups of 3-4 5 minutes pro 5 minutes con 10 minute class discussion
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